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Some sufferers may also experience facial pain, blocked sinuses, headaches, earache and tiredness.

Symptoms tend to flare up when the body mistakes tree pollen or pollen from shrubs as dangerous organisms, forcing the immune system to go into action by sending out antibodies to try to prevent it spreading.

Grass pollen is the most common allergen and affects sufferers between May and July.

Tree pollen, which is common from February to June, and weed pollen (June to September) can also cause hay fever.